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#| -*-Scheme-*-
$Id: xform.scm,v 1.15 2003/02/14 18:28:14 cph Exp $
Copyright 1985, 1989, 1990, 1999, 2001, 2002 Massachusetts Institute of Technology
This file is part of MIT/GNU Scheme.
MIT/GNU Scheme is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
MIT/GNU Scheme is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.
|#
;;;; Instance Variable Transformation
(declare (usual-integrations))
(define (transform-instance-variables transforms name free expression)
(fluid-let ((name-of-self name))
(transform-expression (remove-transforms transforms free) expression)))
(define name-of-self)
(define (transform-expression transforms expression)
((scode-walk scode-walker expression) transforms expression))
(define (transform-expressions transforms expressions)
(define (transform-expression-loop expressions)
(if (null? expressions)
'()
(cons (transform-expression transforms (car expressions))
(transform-expression-loop (cdr expressions)))))
(transform-expression-loop expressions))
(define (remove-transforms transforms names)
(define (loop transforms)
(cond ((null? transforms) '())
((memq (caar transforms) names)
(loop (cdr transforms)))
(else
(cons (car transforms)
(loop (cdr transforms))))))
(loop transforms))
(define (transform-constant transforms constant)
transforms
constant)
(define (transform-variable transforms variable)
(let ((entry (assq (scode-variable-name variable) transforms)))
(if (not entry)
variable
(make-combination vector-ref (list name-of-self (cdr entry))))))
(define (transform-assignment transforms assignment)
(assignment-components assignment
(lambda (name value)
(let ((entry (assq name transforms))
(value (transform-expression transforms value)))
(if (not entry)
(make-assignment name value)
(make-combination vector-set!
(list name-of-self
(cdr entry)
value)))))))
(define (transform-combination transforms combination)
(combination-components combination
(lambda (operator operands)
(make-combination (transform-expression transforms operator)
(transform-expressions transforms operands)))))
(define (transform-lambda transforms expression)
(lambda-components** expression
(lambda (pattern bound body)
(make-lambda** pattern bound
(transform-expression (remove-transforms transforms bound)
body)))))
(define (transform-open-block transforms open-block)
(open-block-components open-block
(lambda (names declarations body)
(make-open-block names declarations
(transform-expression (remove-transforms transforms
names)
body)))))
(define (transform-definition transforms definition)
(definition-components definition
(lambda (name value)
(error "Free definition encountered:" name)
(make-definition name (transform-expression transforms value)))))
(define (transform-sequence transforms expression)
(make-sequence (transform-expressions transforms
(sequence-actions expression))))
(define (transform-conditional transforms conditional)
(conditional-components conditional
(lambda (predicate consequent alternative)
(make-conditional (transform-expression transforms predicate)
(transform-expression transforms consequent)
(transform-expression transforms alternative)))))
(define (transform-disjunction transforms disjunction)
(disjunction-components disjunction
(lambda (predicate alternative)
(make-disjunction (transform-expression transforms predicate)
(transform-expression transforms alternative)))))
(define (transform-comment transforms comment)
(comment-components comment
(lambda (text expression)
(make-comment text (transform-expression transforms expression)))))
(define (transform-delay transforms expression)
(make-delay (transform-expression transforms (delay-expression expression))))
(define scode-walker
(make-scode-walker transform-constant
`((ASSIGNMENT ,transform-assignment)
(COMBINATION ,transform-combination)
(COMMENT ,transform-comment)
(CONDITIONAL ,transform-conditional)
(DEFINITION ,transform-definition)
(DELAY ,transform-delay)
(DISJUNCTION ,transform-disjunction)
(LAMBDA ,transform-lambda)
(OPEN-BLOCK ,transform-open-block)
(SEQUENCE ,transform-sequence)
(VARIABLE ,transform-variable))))
|